Bottom line: YES it works.
For every customer who walks away, they sell more and at higher prices.
If you go in with the understanding that it's OK to walk away, you hold the power.
If you go in and get intimidated, they hold the power.
Frustrating when you are just looking and trying to decide what you like but when it comes time to buy, you just have to hold firm and be prepared to walk away. Amazing how many times they will chase you out the door with a lower price.
My suggestion just tell them you are looking and not buying today and then don't worry if they get upset because you were honest about your intentions. Otherwise, check out the RV shows where they won't be able to focus on you.